Solved

How should I do this?

Posted on 2008-10-02
7
141 Views
Last Modified: 2012-05-05
I have a "generic" search dialog that I am able to fill a datatable with two columns for searching. These two
columns may be different types from Integer to String to DateTime

There is one textbox for entering a search term. How would I format the DataTable's RowFilter according to the
text entered based on the types of the two columns in the datatable?

Currently, we have it like the code below and it is causing problems when the first column is an Integer column.
The objColl is a collection with an ISearchableWrapper interface that returns the NAME of the particular column in
the SearchItem_DataPropertyName and SearchDesc_DataPropertyName properties. The items in the collection are
what is loaded into the DataTable.

Any ideas on how I should approach this? Have you done something like this before?
Private Sub txtFilter_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtFilter.TextChanged

    If Me.tbl IsNot Nothing Then 

      Me.tbl.DefaultView.RowFilter = Me.objColl.SearchItem_DataPropertyName & " like '" &  Me.txtFilter.Text & "%' OR " & 

                                     Me.objColl.SearchDesc_DataPropertyName & " like '" & Me.txtFilter.Text & "%'"

End Sub

Open in new window

0
Comment
Question by:EddieShipman
  • 4
  • 3
7 Comments
 
LVL 10

Accepted Solution

by:
MoreHeroic earned 500 total points
ID: 22626660
Well, doing a string comparison like that you might try casting the unknown type into a string prior to performing the like so that your rowexpression would look something like this:

Me.tbl.DefaultView.RowFilter = "Convert(" & Me.objColl.SearchItem_DataPropertyName & ", 'System.String') like '" &  Me.txtFilter.Text & "%' OR " &
                                     "Convert(" & Me.objColl.SearchDesc_DataPropertyName & ", 'System.String') like '" & Me.txtFilter.Text & "%'"
0
 
LVL 26

Author Comment

by:EddieShipman
ID: 22627832
Nah, we've tried casting and it still gives the error because the value in the DataTable is
still an Integer and you can't use the like operator on integers.
0
 
LVL 10

Expert Comment

by:MoreHeroic
ID: 22628079
That's what I'm saying.  Cast it as part of the expression so that you are in fact using a string.  That's what the Convert(col_name, 'System.String') in the expression would do.  It would still be an integer in the data, you would just cast it for the like comparison.
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 26

Author Comment

by:EddieShipman
ID: 22628997
Oh, I see, but how about datetime values? I can't use LIKE with a partial date
like '06/*' can I? And I certainly can't convert that to a datetime value.

I AM able to determine what the datatype is for each column and do something different for each column, however, knowing what the user is actually searching for is the problem.
He may have an integer column and a datetime column and, in the txtFilter_TextChanged event, the user may enter '06' which would work ok for the Integer but when, he typed the '/', it would break for both datatypes.

Also, in the Convert, wouldn't you convert to the SQL type .vs System.String?



0
 
LVL 10

Expert Comment

by:MoreHeroic
ID: 22633062
You should be able to if the column you're searching is always cast to a string.  As long as the partial search string is the same syntax as your dates you should be fine.
0
 
LVL 10

Expert Comment

by:MoreHeroic
ID: 22633097
You may find this link helpful when dealing with expressions:

http://msdn.microsoft.com/en-us/library/system.data.datacolumn.expression.aspx
0
 
LVL 26

Author Closing Comment

by:EddieShipman
ID: 31502473
Works like a charm. I never thought about using Convert.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Well, all of us have seen the multiple EXCEL.EXE's in task manager that won't die even if you call the .close, .dispose methods. Try this method to kill any excels in memory. You can copy the kill function to create a check function and replace the …
It’s quite interesting for me as I worked with Excel using vb.net for some time. Here are some topics which I know want to share with others whom this might help. First of all if you are working with Excel then you need to Download the Following …
This demo shows you how to set up the containerized NetScaler CPX with NetScaler Management and Analytics System in a non-routable Mesos/Marathon environment for use with Micro-Services applications.
This video shows how to remove a single email address from the Outlook 2010 Auto Suggestion memory. NOTE: For Outlook 2016 and 2013 perform the exact same steps. Open a new email: Click the New email button in Outlook. Start typing the address: …

919 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now